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Test driving a 2002 Pontiac Grand Am on old country road, when hit bumps it is squeaking coming from...

Test driving a 2002 Pontiac Grand Am on old country road, when hit bumps it is squeaking coming from the back. When parked, pushing up and down on the back of the car you do not hear the squeaking. Help!

My car is shaking and jumping and i can not figure out what is wrong with it. It is throwing out a P0300, which is a multiple misfire. I have changed the following parts. Sensors: camshaft, crankshaft...

So, I live in Michigan where the weather is really bad in the winter. There was a slight dusting of snow on the ground this morning, not much at all. I have a 99 Pontiac Grand Am SE 140,000 miles. I p...